GB615763A - Improvements in or relating to means for determining the thickness of surface coatings - Google Patents

Improvements in or relating to means for determining the thickness of surface coatings

Info

Publication number
GB615763A
GB615763A GB2277646A GB2277646A GB615763A GB 615763 A GB615763 A GB 615763A GB 2277646 A GB2277646 A GB 2277646A GB 2277646 A GB2277646 A GB 2277646A GB 615763 A GB615763 A GB 615763A
Authority
GB
United Kingdom
Prior art keywords
thickness
core
spring
electromagnet
meter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2277646A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Birmingham Small Arms Co Ltd
Original Assignee
Birmingham Small Arms Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Birmingham Small Arms Co Ltd filed Critical Birmingham Small Arms Co Ltd
Priority to GB2277646A priority Critical patent/GB615763A/en
Publication of GB615763A publication Critical patent/GB615763A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
    • G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

615,763. Electric gauges. BIRMINGHAM SMALL ARMS CO., Ltd., and WALTON, K. July 31, 1946, No. 22776. [Class 37] A device for measuring the thickness of a non- magnetic coating on a magnetic base comprises an electromagnet 17, the core 7 of which is biassed upwardly by a spring 11, and a coaxial plunger 25 also biassed upwardly by a spring 33, the core and plunger normally contacting one another at contacts 39, 41 as shown in Fig. 1. In operation, the D.C. through the coil 17 is first adjusted at 59 to a maximum. The core 7 is then forced downwardly by means of the handle 37 into engagement with the work being gauged where it is held by the electromagnet. The handle 37 is then released and breaks the circuit of a normally lit lamp 73 at contacts 39, 41. The current in coil 17 is then gradually reduced by adjusting resistor 59 until the spring 11 pulls the core 7 away from the work, when the lamp 73 is relit. The current flow at this instant is a measure of the non-magnetic coating thickness and is read on the meter 55 which may be graduated to read thickness direct. A variable resistor 6 is used to compensate for ageing of the supply battery 53 and the meter may be shunted by an adjustable resistor to cater for a plurality of thickness ranges.
GB2277646A 1946-07-31 1946-07-31 Improvements in or relating to means for determining the thickness of surface coatings Expired GB615763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2277646A GB615763A (en) 1946-07-31 1946-07-31 Improvements in or relating to means for determining the thickness of surface coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2277646A GB615763A (en) 1946-07-31 1946-07-31 Improvements in or relating to means for determining the thickness of surface coatings

Publications (1)

Publication Number Publication Date
GB615763A true GB615763A (en) 1949-01-11

Family

ID=10184891

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2277646A Expired GB615763A (en) 1946-07-31 1946-07-31 Improvements in or relating to means for determining the thickness of surface coatings

Country Status (1)

Country Link
GB (1) GB615763A (en)

Similar Documents

Publication Publication Date Title
US2384529A (en) Magnetic instrument
GB615763A (en) Improvements in or relating to means for determining the thickness of surface coatings
US2509986A (en) Electronic height gauge
GB637471A (en) Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases
US2567333A (en) Thickness testing machine
GB575150A (en) Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials
US2659857A (en) Instrument for indicating permeability
US2360121A (en) Electrical gauge
GB1213121A (en) Measurement of surface characteristics
GB595727A (en) An improved caliper gauge for use in measuring the core diameter of splined, toothedand like workpieces
GB568069A (en) Improvements in or relating to apparatus for measuring or indicating distances between opposed surfaces or opposed parts of a continuous surface
US2867784A (en) Corrosion testing device
GB553711A (en) Improvements in or relating to gauges
GB574225A (en) Improvements in or relating to linear dimension gauges
GB609534A (en) Improvements in and relating to electrical height gauges
GB609400A (en) Electrical gauging instrument
GB698028A (en) Improvements in dial bore gage
GB580562A (en) Improvements in or relating to apparatus for gauging annular bodies
GB619331A (en) Improvements relating to internal linear-dimension gauges
JPS562572A (en) Measuring instrument for characteristic of electronic parts
SU108583A1 (en) Electromagnetic device for determining the thickness of non-magnetic coatings
US3027650A (en) Gage
GB624567A (en) Improvements in or relating to resistance measuring apparatus
GB617423A (en) Electronic gauge and indicating means
GB578228A (en) Improvements in or relating to comparator gauges for measuring internal diameters